Green’s Dictionary of Slang

drunkenness.

1856		Mons. Merlin 18 Oct. 6/2: Should he [drink] to excess, he does not become, like ordinary mortals, intoxicated, but ‘fresh;’ he may advance to ‘boskiness,’ or get ‘tight screwed’.
1887		Judy 31 Aug. 101: The Town Councillor had a squabble with his parent [...] and accused him of boskiness [F&H].